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Simplifying -15 = 4u + -7 Reorder the terms: -15 = -7 + 4u Solving -15 = -7 + 4u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-4u' to each side of the equation. -15 + -4u = -7 + 4u + -4u Combine like terms: 4u + -4u = 0 -15 + -4u = -7 + 0 -15 + -4u = -7 Add '15' to each side of the equation. -15 + 15 + -4u = -7 + 15 Combine like terms: -15 + 15 = 0 0 + -4u = -7 + 15 -4u = -7 + 15 Combine like terms: -7 + 15 = 8 -4u = 8 Divide each side by '-4'. u = -2 Simplifying u = -2
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